Hi,
Spondylolithesis is forward slippage of a lumbar (lower back) vertebra on the vertebra below it.In adults, the most common cause is degenerative disease (like arthritis) and the slip usually occurs between the fourth and fifth lumbar vertebrae.
Other causes of spondylolisthesis include stress fractures (caused by repetitive hyper-extension of the back, commonly seen in gymnasts), and traumatic fractures.
Symptoms may include lower back pain and pain in the thighs and buttocks, stiffness, muscle tightness, and tenderness in the slipped area. Neurologic damage (leg weakness or changes in sensation) may result from pressure on nerve roots and may cause pain radiating down the legs
For more information please click the link below:
http://www.nlm.nih.gov/medlineplus/ency/article/001260.htm
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Regards,
Dr.Yetimyan